fix: clash doesn't support snell v4 yet.

[quul]

If there's a Snell v4 node in config, there will be an error like

FATA[0000] Parse config error: proxy 102: snell version error: 4

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[codecov]

Codecov Report

Patch coverage has no change and project coverage change: -0.13 ⚠️

Comparison is base (3cf05ed) 86.15% compared to head (8fff83d) 86.02%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #226      +/-   ##
==========================================
- Coverage   86.15%   86.02%   -0.13%     
==========================================
  Files          45       45              
  Lines        1993     1996       +3     
  Branches      490      491       +1     
==========================================
  Hits         1717     1717              
- Misses        133      135       +2     
- Partials      143      144       +1     

Impacted Files	Coverage Δ
lib/utils/clash.ts	71.01% <0.00%> (-3.23%)	⬇️

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